# Configuring Synapse to authenticate against an OpenID Connect provider Synapse can be configured to use an OpenID Connect Provider (OP) for authentication, instead of its own local password database. Any OP should work with Synapse, as long as it supports the authorization code flow. There are a few options for that: - start a local OP. Synapse has been tested with [Hydra][hydra] and [Dex][dex-idp]. Note that for an OP to work, it should be served under a secure (HTTPS) origin. A certificate signed with a self-signed, locally trusted CA should work. In that case, start Synapse with a `SSL_CERT_FILE` environment variable set to the path of the CA. - set up a SaaS OP, like [Google][google-idp], [Auth0][auth0] or [Okta][okta]. Synapse has been tested with Auth0 and Google. It may also be possible to use other OAuth2 providers which provide the [authorization code grant type](https://tools.ietf.org/html/rfc6749#section-4.1), such as [Github][github-idp]. [google-idp]: https://developers.google.com/identity/protocols/oauth2/openid-connect [auth0]: https://auth0.com/ [authentik]: https://goauthentik.io/ [lemonldap]: https://lemonldap-ng.org/ [okta]: https://www.okta.com/ [dex-idp]: https://github.com/dexidp/dex [keycloak-idp]: https://www.keycloak.org/docs/latest/server_admin/#sso-protocols [hydra]: https://www.ory.sh/docs/hydra/ [github-idp]: https://developer.github.com/apps/building-oauth-apps/authorizing-oauth-apps ## Preparing Synapse The OpenID integration in Synapse uses the [`authlib`](https://pypi.org/project/Authlib/) library, which must be installed as follows: * The relevant libraries are included in the Docker images and Debian packages provided by `matrix.org` so no further action is needed. * If you installed Synapse into a virtualenv, run `/path/to/env/bin/pip install matrix-synapse[oidc]` to install the necessary dependencies. * For other installation mechanisms, see the documentation provided by the maintainer. To enable the OpenID integration, you should then add a section to the `oidc_providers` setting in your configuration file (or uncomment one of the existing examples). See [sample_config.yaml](./sample_config.yaml) for some sample settings, as well as the text below for example configurations for specific providers. ## Sample configs Here are a few configs for providers that should work with Synapse. ### Microsoft Azure Active Directory Azure AD can act as an OpenID Connect Provider. Register a new application under *App registrations* in the Azure AD management console. The RedirectURI for your application should point to your matrix server: `[synapse public baseurl]/_synapse/client/oidc/callback` Go to *Certificates & secrets* and register a new client secret. Make note of your Directory (tenant) ID as it will be used in the Azure links. Edit your Synapse config file and change the `oidc_config` section: ```yaml oidc_providers: - idp_id: microsoft idp_name: Microsoft issuer: "https://login.microsoftonline.com//v2.0" client_id: "" client_secret: "" scopes: ["openid", "profile"] authorization_endpoint: "https://login.microsoftonline.com//oauth2/v2.0/authorize" token_endpoint: "https://login.microsoftonline.com//oauth2/v2.0/token" userinfo_endpoint: "https://graph.microsoft.com/oidc/userinfo" user_mapping_provider: config: localpart_template: "{{ user.preferred_username.split('@')[0] }}" display_name_template: "{{ user.name }}" ``` ### Dex [Dex][dex-idp] is a simple, open-source OpenID Connect Provider. Although it is designed to help building a full-blown provider with an external database, it can be configured with static passwords in a config file. Follow the [Getting Started guide](https://dexidp.io/docs/getting-started/) to install Dex. Edit `examples/config-dev.yaml` config file from the Dex repo to add a client: ```yaml staticClients: - id: synapse secret: secret redirectURIs: - '[synapse public baseurl]/_synapse/client/oidc/callback' name: 'Synapse' ``` Run with `dex serve examples/config-dev.yaml`. Synapse config: ```yaml oidc_providers: - idp_id: dex idp_name: "My Dex server" skip_verification: true # This is needed as Dex is served on an insecure endpoint issuer: "http://127.0.0.1:5556/dex" client_id: "synapse" client_secret: "secret" scopes: ["openid", "profile"] user_mapping_provider: config: localpart_template: "{{ user.name }}" display_name_template: "{{ user.name|capitalize }}" ``` ### Keycloak [Keycloak][keycloak-idp] is an opensource IdP maintained by Red Hat. Follow the [Getting Started Guide](https://www.keycloak.org/getting-started) to install Keycloak and set up a realm. 1. Click `Clients` in the sidebar and click `Create` 2. Fill in the fields as below: | Field | Value | |-----------|-----------| | Client ID | `synapse` | | Client Protocol | `openid-connect` | 3. Click `Save` 4. Fill in the fields as below: | Field | Value | |-----------|-----------| | Client ID | `synapse` | | Enabled | `On` | | Client Protocol | `openid-connect` | | Access Type | `confidential` | | Valid Redirect URIs | `[synapse public baseurl]/_synapse/client/oidc/callback` | 5. Click `Save` 6. On the Credentials tab, update the fields: | Field | Value | |-------|-------| | Client Authenticator | `Client ID and Secret` | 7. Click `Regenerate Secret` 8. Copy Secret ```yaml oidc_providers: - idp_id: keycloak idp_name: "My KeyCloak server" issuer: "https://127.0.0.1:8443/auth/realms/{realm_name}" client_id: "synapse" client_secret: "copy secret generated from above" scopes: ["openid", "profile"] user_mapping_provider: config: localpart_template: "{{ user.preferred_username }}" display_name_template: "{{ user.name }}" ``` ### Auth0 [Auth0][auth0] is a hosted SaaS IdP solution. 1. Create a regular web application for Synapse 2. Set the Allowed Callback URLs to `[synapse public baseurl]/_synapse/client/oidc/callback` 3. Add a rule to add the `preferred_username` claim.
Code sample ```js function addPersistenceAttribute(user, context, callback) { user.user_metadata = user.user_metadata || {}; user.user_metadata.preferred_username = user.user_metadata.preferred_username || user.user_id; context.idToken.preferred_username = user.user_metadata.preferred_username; auth0.users.updateUserMetadata(user.user_id, user.user_metadata) .then(function(){ callback(null, user, context); }) .catch(function(err){ callback(err); }); } ```
Synapse config: ```yaml oidc_providers: - idp_id: auth0 idp_name: Auth0 issuer: "https://your-tier.eu.auth0.com/" # TO BE FILLED client_id: "your-client-id" # TO BE FILLED client_secret: "your-client-secret" # TO BE FILLED scopes: ["openid", "profile"] user_mapping_provider: config: localpart_template: "{{ user.preferred_username }}" display_name_template: "{{ user.name }}" ``` ### Authentik [Authentik][authentik] is an open-source IdP solution. 1. Create a provider in Authentik, with type OAuth2/OpenID. 2. The parameters are: - Client Type: Confidential - JWT Algorithm: RS256 - Scopes: OpenID, Email and Profile - RSA Key: Select any available key - Redirect URIs: `[synapse public baseurl]/_synapse/client/oidc/callback` 3. Create an application for synapse in Authentik and link it to the provider. 4. Note the slug of your application, Client ID and Client Secret. Synapse config: ```yaml oidc_providers: - idp_id: authentik idp_name: authentik discover: true issuer: "https://your.authentik.example.org/application/o/your-app-slug/" # TO BE FILLED: domain and slug client_id: "your client id" # TO BE FILLED client_secret: "your client secret" # TO BE FILLED scopes: - "openid" - "profile" - "email" user_mapping_provider: config: localpart_template: "{{ user.preferred_username }}}" display_name_template: "{{ user.preferred_username|capitalize }}" # TO BE FILLED: If your users have names in Authentik and you want those in Synapse, this should be replaced with user.name|capitalize. ``` ### LemonLDAP [LemonLDAP::NG][lemonldap] is an open-source IdP solution. 1. Create an OpenID Connect Relying Parties in LemonLDAP::NG 2. The parameters are: - Client ID under the basic menu of the new Relying Parties (`Options > Basic > Client ID`) - Client secret (`Options > Basic > Client secret`) - JWT Algorithm: RS256 within the security menu of the new Relying Parties (`Options > Security > ID Token signature algorithm` and `Options > Security > Access Token signature algorithm`) - Scopes: OpenID, Email and Profile - Allowed redirection addresses for login (`Options > Basic > Allowed redirection addresses for login` ) : `[synapse public baseurl]/_synapse/client/oidc/callback` Synapse config: ```yaml oidc_providers: - idp_id: lemonldap idp_name: lemonldap discover: true issuer: "https://auth.example.org/" # TO BE FILLED: replace with your domain client_id: "your client id" # TO BE FILLED client_secret: "your client secret" # TO BE FILLED scopes: - "openid" - "profile" - "email" user_mapping_provider: config: localpart_template: "{{ user.preferred_username }}}" # TO BE FILLED: If your users have names in LemonLDAP::NG and you want those in Synapse, this should be replaced with user.name|capitalize or any valid filter. display_name_template: "{{ user.preferred_username|capitalize }}" ``` ### GitHub [GitHub][github-idp] is a bit special as it is not an OpenID Connect compliant provider, but just a regular OAuth2 provider. The [`/user` API endpoint](https://developer.github.com/v3/users/#get-the-authenticated-user) can be used to retrieve information on the authenticated user. As the Synapse login mechanism needs an attribute to uniquely identify users, and that endpoint does not return a `sub` property, an alternative `subject_claim` has to be set. 1. Create a new OAuth application: https://github.com/settings/applications/new. 2. Set the callback URL to `[synapse public baseurl]/_synapse/client/oidc/callback`. Synapse config: ```yaml oidc_providers: - idp_id: github idp_name: Github idp_brand: "github" # optional: styling hint for clients discover: false issuer: "https://github.com/" client_id: "your-client-id" # TO BE FILLED client_secret: "your-client-secret" # TO BE FILLED authorization_endpoint: "https://github.com/login/oauth/authorize" token_endpoint: "https://github.com/login/oauth/access_token" userinfo_endpoint: "https://api.github.com/user" scopes: ["read:user"] user_mapping_provider: config: subject_claim: "id" localpart_template: "{{ user.login }}" display_name_template: "{{ user.name }}" ``` ### Google [Google][google-idp] is an OpenID certified authentication and authorisation provider. 1. Set up a project in the Google API Console (see https://developers.google.com/identity/protocols/oauth2/openid-connect#appsetup). 2. Add an "OAuth Client ID" for a Web Application under "Credentials". 3. Copy the Client ID and Client Secret, and add the following to your synapse config: ```yaml oidc_providers: - idp_id: google idp_name: Google idp_brand: "google" # optional: styling hint for clients issuer: "https://accounts.google.com/" client_id: "your-client-id" # TO BE FILLED client_secret: "your-client-secret" # TO BE FILLED scopes: ["openid", "profile"] user_mapping_provider: config: localpart_template: "{{ user.given_name|lower }}" display_name_template: "{{ user.name }}" ``` 4. Back in the Google console, add this Authorized redirect URI: `[synapse public baseurl]/_synapse/client/oidc/callback`. ### Twitch 1. Setup a developer account on [Twitch](https://dev.twitch.tv/) 2. Obtain the OAuth 2.0 credentials by [creating an app](https://dev.twitch.tv/console/apps/) 3. Add this OAuth Redirect URL: `[synapse public baseurl]/_synapse/client/oidc/callback` Synapse config: ```yaml oidc_providers: - idp_id: twitch idp_name: Twitch issuer: "https://id.twitch.tv/oauth2/" client_id: "your-client-id" # TO BE FILLED client_secret: "your-client-secret" # TO BE FILLED client_auth_method: "client_secret_post" user_mapping_provider: config: localpart_template: "{{ user.preferred_username }}" display_name_template: "{{ user.name }}" ``` ### GitLab 1. Create a [new application](https://gitlab.com/profile/applications). 2. Add the `read_user` and `openid` scopes. 3. Add this Callback URL: `[synapse public baseurl]/_synapse/client/oidc/callback` Synapse config: ```yaml oidc_providers: - idp_id: gitlab idp_name: Gitlab idp_brand: "gitlab" # optional: styling hint for clients issuer: "https://gitlab.com/" client_id: "your-client-id" # TO BE FILLED client_secret: "your-client-secret" # TO BE FILLED client_auth_method: "client_secret_post" scopes: ["openid", "read_user"] user_profile_method: "userinfo_endpoint" user_mapping_provider: config: localpart_template: '{{ user.nickname }}' display_name_template: '{{ user.name }}' ``` ### Facebook 0. You will need a Facebook developer account. You can register for one [here](https://developers.facebook.com/async/registration/). 1. On the [apps](https://developers.facebook.com/apps/) page of the developer console, "Create App", and choose "Build Connected Experiences". 2. Once the app is created, add "Facebook Login" and choose "Web". You don't need to go through the whole form here. 3. In the left-hand menu, open "Products"/"Facebook Login"/"Settings". * Add `[synapse public baseurl]/_synapse/client/oidc/callback` as an OAuth Redirect URL. 4. In the left-hand menu, open "Settings/Basic". Here you can copy the "App ID" and "App Secret" for use below. Synapse config: ```yaml - idp_id: facebook idp_name: Facebook idp_brand: "facebook" # optional: styling hint for clients discover: false issuer: "https://www.facebook.com" client_id: "your-client-id" # TO BE FILLED client_secret: "your-client-secret" # TO BE FILLED scopes: ["openid", "email"] authorization_endpoint: "https://facebook.com/dialog/oauth" token_endpoint: "https://graph.facebook.com/v9.0/oauth/access_token" jwks_uri: "https://www.facebook.com/.well-known/oauth/openid/jwks/" user_mapping_provider: config: display_name_template: "{{ user.name }}" email_template: "{{ '{{ user.email }}' }}" ``` Relevant documents: * [Manually Build a Login Flow](https://developers.facebook.com/docs/facebook-login/manually-build-a-login-flow) * [Using Facebook's Graph API](https://developers.facebook.com/docs/graph-api/using-graph-api/) * [Reference to the User endpoint](https://developers.facebook.com/docs/graph-api/reference/user) Facebook do have an [OIDC discovery endpoint](https://www.facebook.com/.well-known/openid-configuration), but it has a `response_types_supported` which excludes "code" (which we rely on, and is even mentioned in their [documentation](https://developers.facebook.com/docs/facebook-login/manually-build-a-login-flow#login)), so we have to disable discovery and configure the URIs manually. ### Gitea Gitea is, like Github, not an OpenID provider, but just an OAuth2 provider. The [`/user` API endpoint](https://try.gitea.io/api/swagger#/user/userGetCurrent) can be used to retrieve information on the authenticated user. As the Synapse login mechanism needs an attribute to uniquely identify users, and that endpoint does not return a `sub` property, an alternative `subject_claim` has to be set. 1. Create a new application. 2. Add this Callback URL: `[synapse public baseurl]/_synapse/client/oidc/callback` Synapse config: ```yaml oidc_providers: - idp_id: gitea idp_name: Gitea discover: false issuer: "https://your-gitea.com/" client_id: "your-client-id" # TO BE FILLED client_secret: "your-client-secret" # TO BE FILLED client_auth_method: client_secret_post scopes: [] # Gitea doesn't support Scopes authorization_endpoint: "https://your-gitea.com/login/oauth/authorize" token_endpoint: "https://your-gitea.com/login/oauth/access_token" userinfo_endpoint: "https://your-gitea.com/api/v1/user" user_mapping_provider: config: subject_claim: "id" localpart_template: "{{ user.login }}" display_name_template: "{{ user.full_name }}" ``` ### XWiki Install [OpenID Connect Provider](https://extensions.xwiki.org/xwiki/bin/view/Extension/OpenID%20Connect/OpenID%20Connect%20Provider/) extension in your [XWiki](https://www.xwiki.org) instance. Synapse config: ```yaml oidc_providers: - idp_id: xwiki idp_name: "XWiki" issuer: "https://myxwikihost/xwiki/oidc/" client_id: "your-client-id" # TO BE FILLED client_auth_method: none scopes: ["openid", "profile"] user_profile_method: "userinfo_endpoint" user_mapping_provider: config: localpart_template: "{{ user.preferred_username }}" display_name_template: "{{ user.name }}" ``` ### Apple Configuring "Sign in with Apple" (SiWA) requires an Apple Developer account. You will need to create a new "Services ID" for SiWA, and create and download a private key with "SiWA" enabled. As well as the private key file, you will need: * Client ID: the "identifier" you gave the "Services ID" * Team ID: a 10-character ID associated with your developer account. * Key ID: the 10-character identifier for the key. https://help.apple.com/developer-account/?lang=en#/dev77c875b7e has more documentation on setting up SiWA. The synapse config will look like this: ```yaml - idp_id: apple idp_name: Apple issuer: "https://appleid.apple.com" client_id: "your-client-id" # Set to the "identifier" for your "ServicesID" client_auth_method: "client_secret_post" client_secret_jwt_key: key_file: "/path/to/AuthKey_KEYIDCODE.p8" # point to your key file jwt_header: alg: ES256 kid: "KEYIDCODE" # Set to the 10-char Key ID jwt_payload: iss: TEAMIDCODE # Set to the 10-char Team ID scopes: ["name", "email", "openid"] authorization_endpoint: https://appleid.apple.com/auth/authorize?response_mode=form_post user_mapping_provider: config: email_template: "{{ user.email }}" ``` ### Django OAuth Toolkit [django-oauth-toolkit](https://github.com/jazzband/django-oauth-toolkit) is a Django application providing out of the box all the endpoints, data and logic needed to add OAuth2 capabilities to your Django projects. It supports [OpenID Connect too](https://django-oauth-toolkit.readthedocs.io/en/latest/oidc.html). Configuration on Django's side: 1. Add an application: https://example.com/admin/oauth2_provider/application/add/ and choose parameters like this: * `Redirect uris`: https://synapse.example.com/_synapse/client/oidc/callback * `Client type`: `Confidential` * `Authorization grant type`: `Authorization code` * `Algorithm`: `HMAC with SHA-2 256` 2. You can [customize the claims](https://django-oauth-toolkit.readthedocs.io/en/latest/oidc.html#customizing-the-oidc-responses) Django gives to synapse (optional):
Code sample ```python class CustomOAuth2Validator(OAuth2Validator): def get_additional_claims(self, request): return { "sub": request.user.email, "email": request.user.email, "first_name": request.user.first_name, "last_name": request.user.last_name, } ```
Your synapse config is then: ```yaml oidc_providers: - idp_id: django_example idp_name: "Django Example" issuer: "https://example.com/o/" client_id: "your-client-id" # CHANGE ME client_secret: "your-client-secret" # CHANGE ME scopes: ["openid"] user_profile_method: "userinfo_endpoint" # needed because oauth-toolkit does not include user information in the authorization response user_mapping_provider: config: localpart_template: "{{ user.email.split('@')[0] }}" display_name_template: "{{ user.first_name }} {{ user.last_name }}" email_template: "{{ user.email }}" ```